Telephone system.



sT rEs PATENT onrion.

EDWARD, E. HINRIoHsEN, or new roman. Y., Assrenon TO WESTERN ELECTRIC COMPANY, INCORPORATED, on NEW YORK, N. Y., A conronnrron on NEW YORK.

rnnnrnonn SYSTEM.

.ToaZZ whom it may concern .1

Be it knownthat I, EDWARD E. HINRIOEF 1 SEN, a citizen of the United States, residingat New York, in the county of New York and State of New York, have invented o'ertain new and useful Improvementsin Telephone Systems, of which the following is a full, clear, concise, andexact'description.

v nal associated witha connectedlink circuit.

This invention relates to telephone sys-, tems, and more particularly to such'systems 'of-the central energytype, its object being to reduce the amount of apparatus required in such systems. e

In -.accordance with vention, each telephone line is provided .with

one relayiwhich controlsboth thelin'esigiial individual to the line anda supervisory sig- 'This'invention is illustrated in the'accom panying drawing s, wherein Figure 1 shows a telephone system containing one embodi ment of the invention; and Fig. 2 is a per,- spective of therelayjassociated'. with thetelephone line. p

i In Fig. 1 of the drawings there are shown two telephone lines-A and Bwhich ex:

tend from thesubscribers stations to a cens tral oflice, and there terminate in jacks. A

cord circuit C is alsolocated at the central otfice for interconnecting thetelephonejlines.

Associated with each line is a relay 5 having two windings. This relay has two armatures- 6'and T' -which are so adjusted that whenthe'relay 5 is partially energized, upon the removal of the receiver from the switchhook, therelay attracts its armature 7 but does not'attra'ct its armature 6. Upon the attraction of this armature 7, while arma:

.ture6 is itsunattracted position, a line lamp 8 is lightedover circuit whichrin-. cludes a. normally -open contact 27. (now closed); controlled by armature"? and a normally closed contact 26 controlledby armature6.- The lighting of the line lamp 8 is asignal 'to the operator that the subscriber has .inif tiated a call which' may now be answered a feature of this Specification of LettersPatem. 1 Patented Jan. 29, 1918. Application file'd April 24, 1917. Serial No. 164,223. r

the right-hand winding of relay 5 'isnow completed from r. battery through retardation coil 11, ring contactsof the answering plug 9 and the line jack 10, over'one sideof Y the hue A, through the station apparatus,

backoventhe other side of the'line, and

through the right hand winding of relay5 to ground. As a. resultof the establishment .ofthis circuit, relay,5is further energized toattract its armaturefi, thereby opening the operating circuit of thelamp 8 which is thereupon etfaced. Y

store. the receiver to l the switchhook, the

" hereinbeforereferred to circuits of the line f i j relay 5 would be opened, whereupon the relay would be dee'nergizedand release both of its arinatures. Upon the release of armaA.

ture- 6 an operating circuit foransweri'ng Should thesubscriber oil an. it... '16- supervisory lamp 12 is establishedfrom batsv tery through the lamp 12, sleeve contacts.

of the answering plug 9 and the line jack 10, the contact 26 controlled by armature 6,

and resistance 13 to ground. Answering supervisory lamp 12 is thereupon lighted to 3 furnish a disconnect signal.

It, while the receiver at station B is on the switchhook, calling plug 15 be inserted into line jack 16, calling supervisory lamp 17 will be lighted over a circuit from battery through-the lamp 17, sleeve'contacts of the calling plug15 and line jack 16, and

contact 26 controlled by armature 6 of the line relay 5,B, and resistance 13 to ground. a

Subscriber B may be signaled by the. actuationof aringing key 18, and the subscriber,

in response to the operation of the usual call bell, by removingithe receiver from the,

switchhook, causes such an energization of.

line relay 5, that both of its armatures 61and 7 are attracted, whereupon the circuit of lamp 17 isinterrupted and the lamp is ef.

faced. Line lamp 8-B, however, is not lighted, for contact 26 controlled by armature '6 is now open. When subscriber 13 re stores the receiver to the switchhook; relay 5 releases both of its armatures, again lighting calling supervisory lamp 17 toi urnish a disconnect signal.v The calling end of the cord circuit is equipped with a retardation coil 21, similar to retardation coil ciated with theanswering end. V

In Fig. 2 the general construction of the line relay 5 is shown, which, it will be ob;

served is similar to the relay disclosed in the Craft Patent No. 1,156,671; The relay" in this figure, however, has two armatures.

which are mounted upon opposite sides of thei windings and upon a rearward exten; sionof the core. "Both'armatures are 'L;

shaped, the short arms thereo'it' beingposi tioned upon opposite sides of a polar extension 3l'of the core and in operatrverelat on normally 7 engaged contact springs- 26,- 26

I which areuforced out of engagement bythe attraction of this arniatureupon thecoinplete' or 'full energizationyofthe' relay.

'Thesecontact springs are also mounted uponthe rearward'extension 30. e

'vWhat-is claimedis: s LA telephone-system comprising a telephone line extending "from: asubscribers station toa central office; an electromagnet I connected with the lineyan armature for the electromagnet attractedf upon partial cner-' gization thereof-followingremoval of the receiver from the switehhook, a line signal actuated upon attraction of the armature, a link'circuit for extending the telephone line another armature for the electromagnet'ab tracted upon-the further energization thereof resulting from the connection of thelink circuit with the'line'to restore the line sig 7 nal, and a signal in the linkcircuitactuated by the deenergization ofthe electroinagnet upon the subsequent restoration of the re-' ceiver to the switchhook while the link circuit and the telephone line fLIQCOllIlGCtQCl.

2 A telephone system comprising a tele phone line terminating at a centraloffice, a

linerel'ay connected in the line and having two a rmatures, a'link circuit for, extending vthe telephone line, a line signal controlled bythe line relay actuated when one iarnia- I ture isattracted by the partial energization' of therelayresulting from the closure of the line circuit andctfaced when'the other 31311121:

ture is attracted by. the complete energiza:

7 tion of the 'relay resulting from the connec-s tion-of the link circuit with the telephone} line, and a supervisory signal in the link" circuit actuated upon the release of the sec- 0nd mentioned armature resulting from the opening of the line circuit.

3. A telephone system comprising a telephone line terminating at a central ofiice, a

line relay having two arinatures partially energized overtlie line "upon the closure of theliiie circuit to attract one armature, a l1iie signal actuated upon 7 attraction of the one armature a1 llllk; circuit for extending the telephone line,- the'con'nectioncf the link circuit with the telephone line causing the further energization of the relay over p the line toattract the other armature; there':'

by efiacing the line signahand a supervisory signal'in the link circuit actuated by the deenergiz'ation of the line relay upon the openingot the line circuit; r

4; A telephone fsystem comprising "a telephoneline terminating at a centralfofiice; a

a line relay having'two'armaturesand par-: 7 tiallyienergized overthe line circuit Eupon the closure thereof to attract'onearmaturc,

a line signal, an operating 'circuitthe'reforj completed upon attraction of the one armatu'r'e andfincluding contacts controlledby each armature, a link circuit 'for' extending --the telephone line, the-connection of the link M circuitwitlrthe' telephone line ca'usingthe p further energization of the-relay to attract the other armaturet'othereby interruptthe operating circuit, a supervisory signal'inthe linkcircu1t,1andi an operating} circuit there-j for'fcompleted upon the" release of the} sec-I ond inentioned armature i im x e g'iofthe line circuitl 5. Attelephone "system comprising garjtele-i phone l ne terminating at ar central oflice, a'

line relay having two armatures and par tiallyene'rgizedover theline circuit upon the closurethereof to attract onej armature,

a line lampyan; operating circuit therefor completed upon 'attraction of 'tliejone armature and including a 'norn'nally' closed contact controlledby the other armature; a link circuit for extending the telephone line, the connection'of th'e'link' circuit with the telephone] 1111.6 l y er the line circuit to attract thel. other a1mm-relandinterruptthe q 'e'ratingcircuit," a supervisory lamp in the link, circuit, and an'operating circuit therefor coin-1' pleted, and including a contact 'jof'th'e line Y relay closed; upon the 'deeiiergizationofthe line relay by'the opening of the line circuit.

6. A telephone system comprisinga telephone line terminating inmajack, a line relay having two'rarmatures and partially'energized overthe' line upon the closure thereof to attract Onearmature, a line la'mp', an operT-fl ating circuit therefor completedvnpon at-I a traction of theon'e' armature and including a "normally closed cont act controlled by the.

i,254,69i v z;

7 other armature; a cord circuit terminating deenergization of the line relay upon the l in a plug for extending the line circuit, the "opening of theline circuit and including the engagement of the .plug and jack establishnormally closed contact of the line relay and ing a path over which the line relay is fur-' contacts of the engaged plug and jack.

ther energized to attract the other armature In Witness whereof, I hereunto subscribe and interrupt the operating circuit, a supermy name this; 20th day of April, A. D. 1917.

'visory lamp in the cord circuit, and an opcrating circuit therefor completed. by the E. HINRICHSEN.

, (topics of this patent may be obtained for. five cents each, byaddressing the Commissioner M litants,

Washington, D. G. 

